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DIY Glow 3D Printer
Charge Your Cellphone Using Wasted Heat (and Build a Steampunk Wall-E)
DIY Lead Acid Battery Charger
Make your own LED bulb replacement for regular torchlight
FREE Hidden Electricity!
Make A Handheld Solar Power Supply
Solar Rechargeable Battery Powered PSP Charger
6 million rupee LED flashlight out of a Lithium Battery!
How to make your own LED lightbulbs
Add a rapid-fire button to your mouse using a 555 timer
Altoids Tin Speaker